Question

If the first trophic level in a food chain contains 5000 units of energy, how manu units of energy are transferred to the third trophic level

Answer 1

First trophic level organism get 5000 units of energy...

applying 10% law....
according to which,only 10% of the energy entering a particular trophic level(feeding level) of organism is available for transfer to the next higher trophic level.

second trophic level will get=
10% of 5000
=500 units of energy.

third trophic level=10% of 500
=50 units of energy.

so, the answer is 50 units.
50 units of energy will transfer in third trophic level.

Answer 2

A pyramid of energy represents how much energy, initially from the sun, is retained or stored in the form of new biomass at each trophic level in an ecosystem. Typically, about 10% of the energy is transferred from one trophic level to the next, thus preventing a large number of trophic levels.